Motorcycle bumper



FIG. 1 is a perspective view of a motorcycle bumper showing our new design, the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a top plan view thereof, the bottom view being a mirror image of the top view shown;

FIG. 3 is a rear elevational view thereof; and,

FIG. 4 is a side elevational view thereof, the opposite side being a mirror image of that side shown.

The front view of the motorcyle bumper is flat and unornamented. 

The ornamental design for a motorcycle bumper, as shown and described. 